Ambrose kohleb



- 'A. KOHLER.

Hot Air Furnace.

No. 69,820. Patented 0m. 15, 1867.

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Lctlcrs Patent No. 69,820, dated October 15, 1867. i

HOT-AIR FURNACE.

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Be it known that I, AMBROSE KoIILER, of Boston, in the county of Suffolk, and State of .Mas saehusetts, have invented an Improvement in Hot-Air Furnaces; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention sulficieut to enable those skilled in the art to practise it.

The object of my invention is to increase within the practical limits generally occupied by a hot-air furnace the heat-nccumulating and radiating surface, or the number of heataccumulating and radiating surfaces exposed to the direct action of the heat'from the fire-pot, and in such manner that the whole may bemade available for heating the air in a common distributing-chamber, or that part of the heat may be drawn direct from an inner chamber, as circumstances may render desirable.

In my construction I arrange within the main hot-air chamber, and between the fire-pot cylinder and the walls of said main chamber, auxiliary heat-absorbing and heat-radiating surfaces for receiving and imparting heat, and for forming an auxiliary hot-air chamber, which may be used in common with the main chamber or as an independent reservoir and communicator of best. And my invention consists in combining with this con-. struction a series of flue pipes leading downwards and inwards from the outer flame-chamber into a central flame-chamber leading into the main centre flue, (such centre chamber being provided with a damper by which it can be made common with the main flamemhamber directly over the fire-pot,) this arrangementeil'ecting an equable distribution of heat over the heat-absorbing and radiating surfaces.

The drawings represent a furnace embodying the invention, A showing the same in central vertical section through the furnace opening and the cold-air box. B, a plan of the furnace, the upper or cap-plate being removed. 6: denotes the fire-pot or combustion-chamber; b, the ash-pit; a, the furnace or fire-pot door; at, the to -air box; a, the main flue. Above the fire-potis a chamber or cylindcnf, through which the flame and other volatile products of combustion puss directly to the main flue e, the outer surface of this cylinder compo sing the heat-radiating surface of the common furnace, the cold air being generally received from the cold-air box into the main chamber heated by impingement upon the outer surface of the eylindcrf, and thence distributed by the pipes h.

In the present construction I expa'nd the top of the fire-pot, mount upon it a cylinder, 2, and place between this and the cylindrfa cylinder, 7:, as seen at A, the firepot or chamber opening around its upper surface into the space a: between the two cylinders z'ic, phis space thereby constituting a thin flame-chamber, x, for receiving the volatile products of combustion, which, passing through it, and heating its opposite surfaces, escape at its top through flue pipes Zihto the main line e. While cold air is supplied to tho air-heating chamherg through the cold-air box cl, a pipe, 122, leading from this box, supplies the inner air-heating chamber a, the outer surface of f, the inner surface of k, and the outer surface of 2', thus constituting three direct air-heating or heat radiating surfaces, the opposite surface of each being heated by the direct impingement of flame from the firepot. From the respective outer and inner hot-air chambers y and n the air is distributed to the various rooms or localities to be heated by conducting pipes h and 22,01" the heat may all emerge from the main chamber g by establishing a direct communication between the two chambers through a valve, q a damper being in such case placed in the pipe 1), and being closed, or such pipe being dispensed with. It is often very desirable, however, while heating all or many of the various apartments of a house, to be able at times to concentrate most of the heat into one room, as, for instance, in the muinliving-room of the house, and for this purpose I employthe pipe leading direct from the chamber at most immediately heated from thefire-potf.

When the tire is to be kindled, a damper, :r, controlling the direct connection between the combustion-chamber and main flue is opened, and the smoke, flame, and other products of combustion will then pass directly oii' through the main flue. When the fire is sufficiently kindled this damper is closed, as seen at A, and the flame, gases, do, will then pass around the heat-absorbing surfaces, as before explained, and as denoted by the arrows in red, the arrows in blue denoting the course of the cold air into and the hot air from. the furnace. It will be observed that the ilame-chamber x opens at bottom directly into the fire-pot, and that the fiue pipes Zalso slant downwards and open into the flue-chamber directly over the fire-pot. This arrangement keeps the furnace free from accumulations of carbon deposits, as all such drop directly into the combustion-ehumber,-as will be readily understood. 1

I claim, in combination with the flume-chambersf and :v, and the hot-air chambers g and n, the arrangement of the series of lines Z running from the chamber a; into a flue-chamber directly under the main flue c and over the fiauic chambcrf, substantially as shown and described.

- AMBROSE KOHLER.

Witnesses I I. 

